JavaScript UI Libraries & Blazor Components Suite – Smart UI › Forums › ScrollBar › Scroll Bar Div Usage

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  • December 19, 2019 at 5:49 pm #100539
    admin
    Keymaster

    Hello,
    I am trying to replace the window scroll bar in a div by using the smart scroll bar.
    I am having issues with the following:

    1. I am unable to get the scrollbar to respond to mouse scrolling
    2. scrolling the div down using the change event is inherently laggy and not a good solution to achieve what I want. I understand the scroll bar seems to be developed as a value selector and not as a scroll bar. What is the best way to achieve my desired solution? I am have a div next to a list box, the list box uses the smart scroll bar without lag. I want my div to mirror this but it does not seem to be a simple task. Any help would be greatly appreciated.
    December 20, 2019 at 9:32 am #100542
    Hristofor
    Member

    Hi ctstrist,
    ScrollBar’s change event is fired when the scroll buttons or the scroll thumb is being pressed or dragged accordingly. In order to scroll the content of a container you need to listen to that event and use the value of the ScrollBar to set the scrollTop/scrollLeft of the target container. Here’s a simple example:

    
<!DOCTYPE html>
<html lang="en">
<head>
<!-- references to JS and CSS -->
    <style>
        #scrollableContainer {
            width: 500px;
            height: 200px;
            border: 1px solid black;
            position: relative;
            overflow: hidden;
        }
        #innerScrollableContainer {
            width: 100%;
        }
    </style>
    <script>
        window.onload = function () {
            let scrollBar = document.getElementById('verticalScrollBar'),
                scrollableContainer = document.getElementById('scrollableContainer'),
                innerScrollableContainer = document.getElementById('innerScrollableContainer');
            scrollBar.max = innerScrollableContainer.offsetHeight - scrollableContainer.offsetHeight;
            scrollBar.addEventListener('change', function (event) {
                scrollableContainer.scrollTop = this.value;
            });
        }
    </script>
</head>
<body>
 <smart-scroll-bar orientation="vertical" id="verticalScrollBar"></smart-scroll-bar>
 <div id="scrollableContainer">
        <div id="innerScrollableContainer">
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        </div>
    </div>
</body>
</html>

    There’s should not be any issues/lagg if done properly. Additionaly if you want to add option to scroll using mouse wheel, you will have to listen to the wheel event on the target container and add your custom logic to change the value of the Scrollbar. The event is standart and well documented in the MDN Web Docs.
    Best Regards,
    Christopher
    Smart HTML Elements Team
    https://www.htmlelements.com

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